I use a Nikon D90 with a 50mm f1.4 lens. I only use my iPhone when I do not have anything else available...
For the morning shots, I had to crank the ISO speed up to 1000 to get 1/30 sec shutter speed @ f2.8. I try and not open up more than 2.8 otherwise only 1 mm will be in focus and the rest will be a blur... It was quite dark in my hotel room at 6am!
That is dedication! I respect the level you are taking it to and feel shamed by my iPhone